import './main.css'
const {toLowerCase,toUpperCase}=require('./b.js')
const a="Hello"
console.log(a)
console.log(toLowerCase(a))
console.log(toUpperCase(a))
let odiv=document.createElement('div')
odiv.textContent='Nihao'
document.body.appendChild(
    odiv
)

module.exports=a;  //commonjs

